2 * llc_s_ac.c - actions performed during sap state transition.
5 * Functions in this module are implementation of sap component actions.
6 * Details of actions can be found in IEEE-802.2 standard document.
7 * All functions have one sap and one event as input argument. All of
8 * them return 0 On success and 1 otherwise.
10 * Copyright (c) 1997 by Procom Technology, Inc.
11 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
13 * This program can be redistributed or modified under the terms of the
14 * GNU General Public License as published by the Free Software Foundation.
15 * This program is distributed without any warranty or implied warranty
16 * of merchantability or fitness for a particular purpose.
18 * See the GNU General Public License for more details.
21 #include <linux/netdevice.h>
23 #include <net/llc_pdu.h>
24 #include <net/llc_s_ac.h>
25 #include <net/llc_s_ev.h>
26 #include <net/llc_sap.h>
30 * llc_sap_action_unit_data_ind - forward UI PDU to network layer
32 * @skb: the event to forward
34 * Received a UI PDU from MAC layer; forward to network layer as a
35 * UNITDATA INDICATION; verify our event is the kind we expect
37 int llc_sap_action_unitdata_ind(struct llc_sap
*sap
, struct sk_buff
*skb
)
39 llc_sap_rtn_pdu(sap
, skb
);
44 * llc_sap_action_send_ui - sends UI PDU resp to UNITDATA REQ to MAC layer
46 * @skb: the event to send
48 * Sends a UI PDU to the MAC layer in response to a UNITDATA REQUEST
49 * primitive from the network layer. Verifies event is a primitive type of
50 * event. Verify the primitive is a UNITDATA REQUEST.
52 int llc_sap_action_send_ui(struct llc_sap
*sap
, struct sk_buff
*skb
)
54 struct llc_sap_state_ev
*ev
= llc_sap_ev(skb
);
57 llc_pdu_header_init(skb
, LLC_PDU_TYPE_U
, ev
->saddr
.lsap
,
58 ev
->daddr
.lsap
, LLC_PDU_CMD
);
59 llc_pdu_init_as_ui_cmd(skb
);
60 rc
= llc_mac_hdr_init(skb
, ev
->saddr
.mac
, ev
->daddr
.mac
);
62 rc
= dev_queue_xmit(skb
);
67 * llc_sap_action_send_xid_c - send XID PDU as response to XID REQ
69 * @skb: the event to send
71 * Send a XID command PDU to MAC layer in response to a XID REQUEST
72 * primitive from the network layer. Verify event is a primitive type
73 * event. Verify the primitive is a XID REQUEST.
75 int llc_sap_action_send_xid_c(struct llc_sap
*sap
, struct sk_buff
*skb
)
77 struct llc_sap_state_ev
*ev
= llc_sap_ev(skb
);
80 llc_pdu_header_init(skb
, LLC_PDU_TYPE_U
, ev
->saddr
.lsap
,
81 ev
->daddr
.lsap
, LLC_PDU_CMD
);
82 llc_pdu_init_as_xid_cmd(skb
, LLC_XID_NULL_CLASS_2
, 0);
83 rc
= llc_mac_hdr_init(skb
, ev
->saddr
.mac
, ev
->daddr
.mac
);
85 rc
= dev_queue_xmit(skb
);
90 * llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID
92 * @skb: the event to send
94 * Send XID response PDU to MAC in response to an earlier received XID
95 * command PDU. Verify event is a PDU type event
97 int llc_sap_action_send_xid_r(struct llc_sap
*sap
, struct sk_buff
*skb
)
99 u8 mac_da
[ETH_ALEN
], mac_sa
[ETH_ALEN
], dsap
;
101 struct sk_buff
*nskb
;
103 llc_pdu_decode_sa(skb
, mac_da
);
104 llc_pdu_decode_da(skb
, mac_sa
);
105 llc_pdu_decode_ssap(skb
, &dsap
);
106 nskb
= llc_alloc_frame(NULL
, skb
->dev
, LLC_PDU_TYPE_U
,
107 sizeof(struct llc_xid_info
));
110 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
, dsap
,
112 llc_pdu_init_as_xid_rsp(nskb
, LLC_XID_NULL_CLASS_2
, 0);
113 rc
= llc_mac_hdr_init(nskb
, mac_sa
, mac_da
);
115 rc
= dev_queue_xmit(nskb
);
121 * llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ
123 * @skb: the event to send
125 * Send a TEST command PDU to the MAC layer in response to a TEST REQUEST
126 * primitive from the network layer. Verify event is a primitive type
127 * event; verify the primitive is a TEST REQUEST.
129 int llc_sap_action_send_test_c(struct llc_sap
*sap
, struct sk_buff
*skb
)
131 struct llc_sap_state_ev
*ev
= llc_sap_ev(skb
);
134 llc_pdu_header_init(skb
, LLC_PDU_TYPE_U
, ev
->saddr
.lsap
,
135 ev
->daddr
.lsap
, LLC_PDU_CMD
);
136 llc_pdu_init_as_test_cmd(skb
);
137 rc
= llc_mac_hdr_init(skb
, ev
->saddr
.mac
, ev
->daddr
.mac
);
139 rc
= dev_queue_xmit(skb
);
143 int llc_sap_action_send_test_r(struct llc_sap
*sap
, struct sk_buff
*skb
)
145 u8 mac_da
[ETH_ALEN
], mac_sa
[ETH_ALEN
], dsap
;
146 struct sk_buff
*nskb
;
150 llc_pdu_decode_sa(skb
, mac_da
);
151 llc_pdu_decode_da(skb
, mac_sa
);
152 llc_pdu_decode_ssap(skb
, &dsap
);
154 /* The test request command is type U (llc_len = 3) */
155 data_size
= ntohs(eth_hdr(skb
)->h_proto
) - 3;
156 nskb
= llc_alloc_frame(NULL
, skb
->dev
, LLC_PDU_TYPE_U
, data_size
);
159 llc_pdu_header_init(nskb
, LLC_PDU_TYPE_U
, sap
->laddr
.lsap
, dsap
,
161 llc_pdu_init_as_test_rsp(nskb
, skb
);
162 rc
= llc_mac_hdr_init(nskb
, mac_sa
, mac_da
);
164 rc
= dev_queue_xmit(nskb
);
170 * llc_sap_action_report_status - report data link status to layer mgmt
172 * @skb: the event to send
174 * Report data link status to layer management. Verify our event is the
177 int llc_sap_action_report_status(struct llc_sap
*sap
, struct sk_buff
*skb
)
183 * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND
185 * @skb: the event to send
187 * Send a XID response PDU to the network layer via a XID INDICATION
190 int llc_sap_action_xid_ind(struct llc_sap
*sap
, struct sk_buff
*skb
)
192 llc_sap_rtn_pdu(sap
, skb
);
197 * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND
199 * @skb: the event to send
201 * Send a TEST response PDU to the network layer via a TEST INDICATION
202 * primitive. Verify our event is a PDU type event.
204 int llc_sap_action_test_ind(struct llc_sap
*sap
, struct sk_buff
*skb
)
206 llc_sap_rtn_pdu(sap
, skb
);
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